Adsorption of Chitosan and Interaction with a Non-Ionic Surfactant on Silica
Optical reflectometry is applied as a tool for studying single and simultaneous adsorption of a carbohydrate, a nonionic surfactant, and a protein, For the nonionic surfactant poly(ethylene oxide) alkyl ether on a silica surface the adsorption process is fast and reversible, and the maximum adsorbed amount was 2.45 mg•m-2. Also, the effect of pH on the adsorption of chitosan on silica, and its interaction with C12EO5 have been studied. The maximum adsorbed amount was obtained for pH ≥6.8 (0.80 mg•m-2). Changes in surface functionality upon adsorbing C12EO5 on a chitosan layer and the protein, bovine serum albumin, are reported. The results are discussed in terms of adsorption kinetics, adsorbed mass plateau values, and reversibility of layer formation.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
B. T. Liu et al., "Adsorption of Chitosan and Interaction with a Non-Ionic Surfactant on Silica", Advanced Materials Research, Vols. 233-235, pp. 1398-1401, 2011